Surviving a zombie apocalypse
You stab your heart, vomiting blood, and drop dead. The undead approach you slowly and started eating your entrails, contaminating you with Zombie Virus, and leave you rotting. Several hours later, you wake up again, feeling mindless. You became a zombie, but you didn't realize it (since you are mindless, duh). As you exit your house looking for victims, a pair of survivors ambush you from behind with sledgehammers and simultaneously crush your head.